no-unnecessary-type-arguments
Disallow type arguments that are equal to the default.
🔒
Extending "plugin:@typescript-eslint/strict-type-checked" in an ESLint configuration enables this rule.
🔧
Some problems reported by this rule are automatically fixable by the --fix ESLint command line option.
💭
This rule requires type information to run.
Type parameters in TypeScript may specify a default value. For example:
function f<T = number>(...) {...}
It is redundant to provide an explicit type parameter equal to that default: e.g. calling f<number>(...).
This rule reports when an explicitly specified type argument is the default for that type parameter.
.eslintrc.cjs
module.exports = {
"rules": {
"@typescript-eslint/no-unnecessary-type-arguments": "error"
}
};
Examples
- ❌ Incorrect
- ✅ Correct
function f<T = number>() {}
f<number>();
function g<T = number, U = string>() {}
g<string, string>();
class C<T = number> {}
new C<number>();
class D extends C<number> {}
interface I<T = number> {}
class Impl implements I<number> {}
function f<T = number>() {}
f();
f<string>();
function g<T = number, U = string>() {}
g<string>();
g<number, number>();
class C<T = number> {}
new C();
new C<string>();
class D extends C {}
class D extends C<string> {}
interface I<T = number> {}
class Impl implements I<string> {}
Options
This rule is not configurable.